Stove ok



Oct. .16 '1923.

F. R. DOANE STOVE 0R FURNACE ATTACHMENT Filed Dec. 2, 1922 2 Sheets-Sheet v1 Oct. 16, 1923. 1,470,601

' F. R. DOANE STOVE OR FURNACE AcETAcHMEuT Filed Dec 2. 1922 '2 Sheets-Sheet 2,

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Patented Oct. 16, 1923.

UNITED STATS FRANK R. DUANE, OF VANZDALIA, MICHIGAN.

srovn on summon ATTACHMENT.

Application filed December 2, 1922. Serial No. %,528.

Michigan, have invented a new and useful J Stove or Furnace Attachment, of which the following is a specification.

' This invention relates to heating'stoves, furnaces, or the like, and has'for its object the provision of a device in which the proclucts of combustion are divested of approximately all heat units before being permitted to escape to the chimney flue.

Another object of the invention is the provision of a device in which the relatively cool air,-at the bottom of the furnace is transferred to the center of the heating unit where it is subjected to a more intense heat before delivery to the apartment to be heated.

Other objects will present themselves as the description proceeds, it being within the province of the disclosure to improve generally, devices of that class to which the present invention appertains. It will, of course be understood that slight changes may be made within the scope of what is claimed without departing from the spirit of the invention or sacrificing any of the ad vantages thereof.

In the drawing Figure 1 is a vertical transverse sectional view of a heating plant constructed in accordance with the present invention, there being parts shown in elevation.

Figure 2 is a bottom plan view of a portion of the structure,

Figures 3 and 4 are plan views of baffle plates used in connection with the invention.

Figure 5 is a sectional fragmental plan View taken on line 5-5 of Figure 1.

Figure 6 is a central vertical sectional wlth a clean out door 25 and a casing 26 view of a modified form of heater.

Figure 7 is a central vertical sectional view of a still further modified form of heater.

Referring to the drawings by characters of reference theletter A designates a heater which may be considered as representative of any form of heater, steam, hot water, or hot air.

wall and is provided with the usual stoke door2 and ash door 3.

The fuel burning compartment comprises a caslng 1 having an upper end.

A casing 4c spaced from the heater 1 to form. a compartment 5 is supported on a frame 6, having an opening 7 from the compartment 5 for the circulation of cold air.

An outer casing 8 extending from the floor line to the ceiling and spaced from the easinga provides a second compartment 9, which communicates wlth the room above heater, directly over the fuel compartment;

Pipes 14 connect the drum with the atmosphere, outside the furnace through openings 15 formed in the front of the heater.

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through an opening 10, the first mentioned A tubular member or flue 16 which maybe termed a super-heater, has an upperopen end 17, the bottombeing closed by the drum 12 on which it rests. A plurality of'pipes 18 are'connected to the member 16 near the bottom thereof, the said pipes extending into the compartment 5, are there provided with .downturned ends 19 which reach to a point near the opening the super-heater. M y i i I Baffle plates 20 and 21 are supported in spaced relation within the combustion chamher and surrounding the super-heater l6.

7, admitting cold air to The plates having notches or cut away portions 20 and 21 respectively, the notches being formed on one plate near the center j and on the other at the periphery thereof,

the plates being placed alternatelyto effect a tortuous passage for the products of combustion flowing to the outlet 22 at the top of the heater.

A pipe 23 leads from the opening 22 to an auxiliary heater designated generally by the letter B. A heat chamber 2 L is provided istering with the room above through open- 'ings 30 and 31 respectively. p

A frame 32 supports the casing 26 above the bottom of the furnace forming an opening 33 for the passage of air from one to the other of the compartments 29 and 27.,

Connected to the pipe 23 at a point within. the compartment 2'7 is a pipe 34 which extends downwardly to a point near the bottom of the heat chamber 24, where it enters the said chamber and is here provided with an upturned end 35, The end 35fof the pipe 34 opens directly beneath the closed end of a secondary super-heater 36 which is 10- cated centrally of the heat chamber 24 and extends to the top thereof- Baffle plates 37 and 38 similar to the plates 20 and 21 respectively and similarly arran ed, provide a tortuous passage for the products of combustion through the heat chamber to an opening39 near the top of said chamber. A pipe ,40 leads from the opening 39 to the smoke stack or chimney.

Pipes 41 are connected to the super-heater near the bottom thereof, and are directed downwardly in the. chamber 27, as indicated at 42, being similar to the pipes 18 and for the same purpose.

In operation with combustion taking place in the fire box of the heater 1, the said proclucts pass through the baffle plates 20 and 21, heat radiating from the side walls of the heater 1 into the compartment 5 to rise through the opening 11 into the room above. The cold air of the room flows through the opening 10 and compartments 9 to the'bottom:,.0f said compartment where it rises in the space 5 to be heated in its passagetherethrough. A portion of: the cool air enters the pipesl8, is conducted to the member 16 to be heatedand passes through the open end 17 to the opening 11.

The products of combustion are conveyed through the pipe 23 ,to the heater B, where practically the same action takes place as heretofore described in connection with the heater A. The residue of combustion being discharged from the piper35 rises, in the member 24 and is discharged through the stack. Circulation of air being downwardly from-the room above through the opening 31 ,compartment 29 then upwardly through the compartment 27 and opening 30 back to the room, a. portion passing through the member 36.

As shown in Figure 5 the pipes 14 leading from the drum 21 to the exterior of the furnace are connected to a header 43 which is in communication with the openings 15, the flow of air into said openings being governed by a damper plate 44, it being in this way possible to admit a limited amount of airto the top of the fuel to promote combustion of the gases formed in the combustion chamber above the fuel.

In Figure 6 a slightly modified form of stove is shown comprising an outer casing 45,and an inner casing 46 spaced apart to form a compartment 47. Short fines 48 connect the compartment 47 with the outer air,

nearthe floor so that a circulation of air is established through said compartment, the heated air escaping at the top of the casing. A member 48 corresponding with the member 16 heretofore described is located in tl1e combustion chamber 49 over the fire pot, the member 48 is provided with a pipe 50 which opens to the outside of the casing 45 and establishes a circulation of air through said pipe and member 48, the heated air passing out through the perforated top 51. Products of combustion pass from the chamber 49 through baffle plates 52 and 53, to heat the air in the member 48, and escape to the chimney through the opening 54.

Figure 7 depicts a heater 60 in which is located a super-heater 61. A flange 62 formed about the upper open end of the member 61 provides a closure for the top of the stove and also serves to support the superheate-r in the combustion chamber.

Baifie plates 63 and 64 are supported within the heater and prevents rapid flow of heated air therefrom to the smoke flue.

The member 61 being detachable from the heater may be used in many forms of stoves now on the market or in use.

It will be evident that a furnacebuilt as herein described will provide a heating plant in which practically all heat will be removed from the products of combustion, thereby effecting quite a saving in fuel consumption.

Having thus described the invention, what is claimed is 1. Ina device of the class described, a heater comprising a furnace; a casing spaced from the furnace to form an air heating compartment; a second casing spaced from the first mentioned casing to form a cold air compartment, the two compartments'being in communication for the circulation of air therethrough; a secondary heater comprising a heat chamber, a casing surroundingthe heat chamber and spaced therefrom to form an air heating compartment; a second casing surrounding the other casing and spaced therefrom to form a cold air compartment, the two compartments communicating for the circulation of air therethrough and means for connecting the furnace with the heat chamber.

2. A furnace comprising a combustion chamber having an upper end wall, a tubular member extending downwardly into the combustion chamber from said end wall, a casing spaced from the combustion chamber to form a heating compartment, a second casing spaced from the first mentioned casing to form a cold air compartment, the two compartments communicating for the circulation of air therethrough, and apipe connecting the bottom of the tubular member with the said air circulating compartments.v

3. A furnace comprising a combustion chamber having a closed upper end wall, a

tubular member extending downwardly into the combustion chamber from said end wall, bustion chamber and a damper for controlthe tubular member being closed at its lower lin the said air inlet to the conduits.

end, baflies in the casing about the tubular n testimony that I claim the foregoing member, means for admitting air to the as my own, I have hereto aflixed my signa 5 lower end of the flue frgm a point external ture in the presence of two Witnesses.

to the combustion cham er, a drum beneath the tubular member, the drum having air FRANK DUANE outlets discharging into the combustion Witnesses:

chamber, conduits connected to the drum CHAS. A. Rm'rnn, and having an air inlet external to the com- J. H. RITL'ER. 

